Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax Rate as Percentage of Income Before Income Taxes (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax expense computed at the statutory federal income tax rate	35.00%	35.00%	35.00%
State taxes	1.00%	1.00%	1.00%
IRC Sec. 162(m) limitation	0.80%	0.60%	0.30%
Other	0.10%	(0.50%)	(0.30%)
Effective income tax rate	36.90%	36.10%	36.00%